July, 2012 Continued from page 55
locked while other segments are left open to the operator. Also consider how you store your loaded feeders. Because these can get quite heavy, a stationary mounted rack inside the cabinet instead of the optional pull out style drawer may be the better choice. If the operator extends too much weight, it is conceivable that the cabinet could become unstable, potentially tipping. Given the safety
Meter Mix Dispensing
Continued from page 59
out damage either to the materials or the pump, making the PC pump the correct choice to be used with abra- sive fillers without undue wear. The amount of wear, of course, is equal to the size, composition, and percentage of filler present in the material over the time span in which the pump is in use.
Fillers as fragile as glass micro
balloons, to as destructive as sand, are processed equally as successfully with the PC Pump. When wear occurs, ratios will drift slightly, but due to the technology driving the pumps, this wear can be compensat- ed for by a simple recalibration of the system. This extends the life of the pump, providing continued uptime of the system in actual production. Conversely, in other systems that use pistons, if a seal on a piston or metering rod fails, the system is like- ly to go down and leak material into the production area.
Variety of Fluid Media The use of progressive cavity
metering pumps delivers precise, consistent and reliable dispensing of a wide variety of fluid media. Accurate precision dispensing is achieved independent of media vis- cosity. PC pumps exhibit exceptional resistance to abrasive/filled content and chemically aggressive fluids. Suit able for single or multi-compo- nent applications, PC pumps provide a multitude of operational advan- tages, including constant volume at variable speeds, continuous flow, few moving parts, low maintenance and no cycle time delays for cavity recharge.
Specific design features of pro-
gressive cavity pumps provide addi- tional functional benefits. The cavi- ties taper down toward their ends and overlap with their neighbors, essentially eliminating flow pulsa- tion. No flow meter or check valves are required due to the seal design of progressive cavity pumps. Ultimately, the resulting per-
formance of a meter mix dispense sys- tem is a driving factor in the success of any business that relies on accurate controlled dispensing. When consider- ing the options available in meter mix dispense equipment, the benefits of advanced microprocessor controlled features, combined with PC pump technology, offer manufacturers a flex- ible and powerful material manage- ment solution. Contact: FRC — Fluid Research
Corporation, 15775 Gateway Circle, Tustin, CA 92780 % 714-258-2350 E-mail:
sales@fluidresearch.com Web:
www.fluidresearch.com r
1
SRT Micra is a high-throughput mobile device rework system. Compact in design with SRT’s latest rework technologies, the Micra addresses the industry’s most challenging reworking technologies including PoP, RF Shields, micro-passives (01005), QFN and microBGA (CSP).
SRTMicra is a high throughputmobile device rework system Compact
www.us-tech.com
concerns and the cost of feeders and parts, it is best to err on the side of caution here. Finally, when it comes to heated drying cabinets, Trenton has found that a small unit is all that is needed because, if parts are being purchased correctly, this cabinet only will be used for bake-out sparingly. The company labels
shelf areas with specific con- tract customers’ names and job part numbers, allowing operators to quickly become accustomed to retrieving parts from the cabinet and replacing them at the end of the day. A simple tutorial about
the effects of moisture-based damage along with a few pictures will go a
Page 63 Using Dry Cabinets in High-Mix/Low-Volume Assembly
long way toward proper component handling, and having cabinets locally at each assembly line makes the job that much easier. Combining proper training with the right tools provides better results and, for Trenton, one of the most important tools in the world of high-mix/low-volume is its dry cab- inet storage. Contact: Seika Machinery, Inc.,
A waiting kitted job, with moisture-sensi- tive parts and the bare boards stored in the cabinet.
3528 Torrance Blvd., Suite 100, Torrance, CA 90503 % 310-540-7310 fax: 310-540-7930 E-mail:
info@seikausa.com Web:
www.seikausa.com or Edward S. Wheeler, Director of Manufacturing Engineering, Trenton Technology Inc., Utica, NY E-mail:
ewheeler@trentontech.com Web:
www.trentontechnology.com r
SRT Micra is the 2011 Triple Crown Winner
Good Things Come in Threes…
Circ iuitts Assembly EM Asia Asia Innovation Award
VJ Electronix, Inc. 234 Taylor Street,
Littleton, Massachusetts USA 01460 +1 978 486 4777
www.vjelectronix.com
Circuits Assembly NPI Award
G G A
Global SMT & Packaging Global Technology Award
1
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